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So far, we haven’t had any evidence________this drug is effective.A、whichB、that
So far, we haven’t had any evidence________this drug is effective.A、whichB、that
游客
2024-07-11
6
管理
问题
So far, we haven’t had any evidence________this drug is effective.
选项
A、which
B、that
C、what
D、where
答案
B
解析
本题考查that引导的同位语从句。分析句子可知,空格后面从句是对名词evidence的解释,且从句中主系表结构完整,不缺任何句子成分,因此判断该从句是同位语从句。从属连词that在从句中不充当任何成分,只起连接作用,不可被which代替,也不可省略。由此确定本题答案为B。which可引导定语从句,一般指物,在从句中通常作主语或宾语。what可引导名词性从句,但在从句中要充当成分。where也可引导同位语从句,但含有“在哪里”的意思,该句并不需要“在哪里”的含义。因此,这三个选项都不符合本句的结构或句意的要求,均可以排除。
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